Detachable boiler-flue.



No. 718,609. u PATBNTED JAN. 20, 1903.

. J. F. BRAKE. DETAGHABLE BOILER FLUE.

ARPLIOATION'FILED MAY 27, 1902.

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UNITED STATES PATENT OFFICE.

JULIAN F. DRAKE, OF TRACY, MINNESOTA.

DETACHABLE I aolLi-:R-i--LU E.

SPECIFICATION forming part of Letters Patent No. 718,609, dated January20, 1903.

Application filed May Z7, 1902. Serial No. 109,132. (No model.)

collar 5 is brazed to the end of the ilue 2and To @ZZ whom, it mayconcern: 13e it known that I, JULIAN F. DRAKE, a citlzen of the UnitedStates,residing at Tracy,

in the county of Lyon and State of Minne-v in my prior patent, No.696,421, of April 1, 1902.

The invention consists of the novel devices and combinations of deviceshereinafter described, and defined inthe claim.

The invention is illustrated in the accompanying drawings, wherein likecharacters indicate like parts throughout both views.

Figure 1 is a view, principally in vertical section, with some partsleftin full and others broken away, showing a flue and novel means forsecuring the same to the flue-sheets; and Fig. 2 is a face View of theannular clampingnut removed from Working position.

The numeral 1 indicates the Hue-sheets of a boiler and the numeral 2 oneof the iiues. At one end the flue is secured to the fluesheet by a noveldevice, which is the subject of my present invention. As shown in thedrawings, this novel device is applied to the left-hand end of the flue,while at its righthand end the flue is shown as connected to theflue-sheet by means of a device which was disclosed and claimed in myprior patent, No. 698,471, dated April29, 1902. This latter devicecomprises an inwardlytapering or slightly-conical sleeve 3, which ispreferably braz'ed to the end of the ue, and a thin packing ring orcollar 4, preferably of copper. The said packing-ring 4. is adapted tobe tightly pressed between the tapered sleeve 3 and the seat 1a, formedtherefor in the right-hand flue-sheet. Since this device forms no partof my present invention, the foregoing brief descriptionthereof isdeemed suflcient.

The novel device shown at the left-hand end of the liue comprisesthecollar 5, a loose clamping-ring 6, and clamping-nut 7. The

passes through a quite. closely-fitting seat 1b in the left-handflue-sheet 1. At its outer end the collar 5 is providedwithscrew-threads, on which the nut 7 works. The clampingring 6 looselysurrounds the collar 5, between the clamping-nut 7 andthe adjacentiiuesheet, and on its inner edge it is provided with an annular groove,lin which is placed a packing ofasbestos or similar pliable andnon-fusible material, (indicated'at 8.)

l As is evident, when the parts are applied as shown in Fig. 1 and theclamping-nut 7 is tightened against the clamping-ring 6 the packing 8will be tightly compressed both against the Hue-sheet and the collar 5and will form steamtight joints therewith.

When a number of adjacent iiues of a boiler are applied as abovedescribed, the clamping-nuts 7 will come very close together, and hencethe said nuts should be made round or of annular form and should beprovided with notches or seats 7, to which the pins or lugs of asuitable wrench may be applied to turn the nuts.

In my prior paient, No. 696,421, threads Were cut directly on the endsof the iue. These lthreads of course weakened the iiue more or less. Inmy present device the threads are cut on. the collar 5, and the saidcollar reinforces and strengthens the end of the iiue and enables thesaine to withstand pounding, such as may be necessary to drive the sameout of its seats in the flue-sheets after it has stood for a long timeand become corroded and covered with scale.

The seat 1 in the right-hand flue-sheet should be large enough to permitthe flue to be withdrawn therethrough when covered with about an eighthof an inch of scale, and it must also, of course, be of such size as topass the collar 5 when the clamping nut and ring are removed therefrom..

The necessity for frequently removing iiues of boilers, and especiallyof boilers used in alkali districts, is, as is well known, occasioned bythe rapid collection thereon of scale, which greatly reduces the heatingefficiency of the boiler.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is as follows:

In a boiler, the combination with a Hue- IOO sheet. l lmvingzt flue-seatlb, of the detachable fusible material, tightly pressed against the 1oflue 2, having the permanently and rigidly {lue-sheet and said collarand forming steamsecured collar 5 affording an enlargement tight jointstherewith.

thereof and teleseoping through said seat l, i In testimony whereof Ialiix my signature the clamping-nut 7 screw-threaded on the g inpresence of two Witnesses.

outer end of said collar 5, and the clamping- JULIAN F. DRAKE.

ring 6 loosely fitting said collar 5 between said clamping-nut and saidflue-sheet and provided with the annular packing 8 of non- Witnesses:

ELIZABETH KELIHER, F. D. MERCHANT.

